The ease of hydrolysis of trichlorides of group 15 elements decreases in the order :-

N C l_{3} > P C l_{3} > A s C l_{3} > S b C l_{2} > B i C l_{3}

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P C l_{3} > N C l_{3} > A s C l_{3} > S b C l_{3} > B i C l_{3}

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A s C l_{3} > N C l_{3} > P C l_{3} > S b C l_{3} > B i C l_{3}

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S b C l_{3} > B i C l_{3} > P C l_{3} > N C l_{3} > A s C l_{3}

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Solution

The correct option is A $N C l_{3} > P C l_{3} > A s C l_{3} > S b C l_{2} > B i C l_{3}$
The ease of hydrolysis of trichlorides of group 15 elements decreases in the order $N C l_{3} > P C l_{3} > A s C l_{3} > S b C l_{2} > B i C l_{3}$ .
With increase in the metallic character of elements, the halides become more ionic and their tendency towards hydrolysis (the tendency for the ion of the elements to form a covalent bond with a hydroxide ion from water) decreases.

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